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CVE-2026-49216
Cross-Site Scripting (XSS) in symfony/ux-autocomplete (CVE-2026-49216)
Summary
cross-site scripting in symfony/ux-autocomplete (CVE-2026-49216). Risk of unauthorized operations or information disclosure. Exploitable via ``text``. Mitigation: upgrade to `3.1.0` or later.
AI summary snake-internal / snake-material-v2
A vulnerability tracked as **CVE-2026-49216** has been found in symfony/ux-autocomplete.
Attackers can target a specific entry point like ``text`` over the network to misuse the product.
Risk of unauthorized operations or information disclosure. CVSS score: ?/10.
What to do: upgrade symfony/ux-autocomplete to **3.1.0** or later.
If unsure, ask your IT team or search "symfony/ux-autocomplete CVE-2026-49216" on the vendor's site.
CVE-2026-49216 (symfony/ux-autocomplete) — CWE-79 /
Attack surface: `text` / `option` / `item` / `escape`
Patched: `3.1.0` — apply immediately
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.
❓ What is the problem
**Cross-site scripting (XSS)** (CWE-79) exists in symfony/ux-autocomplete. Attackers reach the vulnerable code path via ``text`` without authentication.
📍 Affected scope
symfony/ux-autocomplete — . Attack surface: `text` / `option` / `item` / `escape`.
🔥 Severity
Severity: ?. Risk of unauthorized operations or information disclosure
🔧 How to fix
Update to **3.1.0**.
🛡️ Workaround
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
🔍 Detection
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run `grep -r 'symfony/ux-autocomplete' .` against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.
Response Actions (7 steps)
Concrete steps and command examples for SOC/SRE teams to execute in order
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1Identify exposure identify
grep -r 'symfony/ux-autocomplete' . | grep -v node_modulesリポジトリと本番環境の依存ファイル (package-lock.json / requirements.txt / go.sum / Gemfile.lock 等) で `symfony/ux-autocomplete` を grep し、稼働しているサービス・バージョンを把握する。
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6Apply patch patch
Upgrade symfony/ux-autocomplete to 3.1.0ステージング環境で 3.1.0 に上げて回帰テスト → 本番反映。回帰テストはアプリの主要ハッピーパスと、Step 3 で見つけた異常検知の続報チェックを含めること。
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7Post-deployment verification verify
Confirm patched version is live in productionパッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番では Step 3 と同じログクエリでアラート再発が無いか継続監視。
Affected packages
composer
symfony/ux-autocomplete
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.1.0"}]}]
References
- web https://github.com/symfony/ux/security/advisories/GHSA-mwqm-4fw3-cjvr
- web https://github.com/symfony/ux/commit/842ae54bc74de389299f975f01aafae272cb0019
- web https://github.com/FriendsOfPHP/security-advisories/blob/master/symfony/ux-autocomplete/CVE-2026-49216.yaml
- web https://github.com/advisories/GHSA-mwqm-4fw3-cjvr